What do we mean by gravitational time dilation?
A) It is the idea that time runs slower in places where gravity is stronger.
B) It is the idea that clocks run slow for people moving at high speed past you.
C) It is the idea that everyone measures time differently, depending on his or her reference frame.
D) It is the idea that clocks run faster in stronger gravitational fields.
A) It is the idea that time runs slower in places where gravity is stronger.
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During the month of June the north celestial pole points towards Polaris, but during the month of December it points
a. just north of Polaris. b. just south of Polaris. c. towards the star Vega. d. towards the star Thuban. e. still towards Polaris.
When neptunium emits a beta particle the result is
A) a different isotope of neptunium. B) uranium. C) plutonium. D) lead. E) none of the above
A weather balloon contains 12.0 m3 of hydrogen gas when it is released from a location at which the temperature is 22°C and the pressure is 101 kPa
It rises to a location where the temperature is -30°C and the pressure is 20 kPa. If the balloon is free to expand so that the pressure of the gas inside is equal to the ambient pressure, what is the new volume of the balloon? A) 14.0 m3 B) 2.38 m3 C) 49.9 m3 D) 82.6 m3 E) 4.16 m3
You do 174 J of work while pulling your sister back on a swing, whose chain is 5.10 m long
You start with the swing hanging vertically and pull it until the chain makes an angle of 32.0° with the vertical with your sister is at rest. What is your sister's mass, assuming negligible friction? A) 22.9 kg B) 19.5 kg C) 26.3 kg D) 28.4 kg